<head>
	<link rel="stylesheet"href="bootstrap-3.3.2-dist/css/bootstrap.css">
	
</head>
<meta http-equiv="content-type"content="text/html;charset=utf-8"/>
<style type="css/text">
.text_field
{
color:azure;
-webkit-box-shadow: -1 1px 4px #3EC3C4;
}
.text_field:hover
{
-webkit-box-shadow: 0 1px 4px #3EC3C4;
}

</style>
<form align="center">
<div>
	<h3>GIẢI PHƯƠNG TRÌNH BẬC HAI</h3>
</div>	
<div>
	<label class="col-sm-2">Phương trình : </label>
	<div class="col-sm-3"><label><input class="form-control"placeholder="nhập a"type="text"/></label></div>
	<div class="col-sm-3"><label><input class="text_field"placeholder="nhập b"type="text"/></label></div>
	<div class="col-sm-3"><label><input placeholder="nhập c"type="text"/></label></div>
</div>
<div align="center">
	<label class="col-sm-2 control-label">Nghiệm: </label>
	<div class="col-sm-10">
		<label>
			<input type="text"class="form-control"readonly="true"/>
		</label>
	</div>
</div>
<div>
	<label>
		<input type="submit"class="btn btn-primary"/>
	</label>
</div>
</form>
